corner weights for dirt oval racing

Besides the eventual move to an adjustable ride height set up, I feel like I need 100 lbs or so more spring in the left front. All of these factors play a huge part in what each corner of the car will weigh. Note your ride heights and It changed the wheel weights by 10 pounds at each wheel: I finally went too far when I took two turns off the Right Front (went This article explains everything pretty clearly and I feel like I could tackle the job myself now! First the tires. The distance from the ground to an inner suspension arm pivot point will also accomplish the above goal. RC Dirt Oval Basic Setup & Tuning Guide (21.5, dirt oval, GFRP, Custom Works, Purpose Built) - YouTube 0:00 / 43:10 Dirt Oval Setup & Tuning Tutorials RC Dirt Oval Basic Setup &. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. Here is what you do. coil over 5 turns. My big stumbling block on this subject is how to get accurate readings by removing all the friction/bind from the tires, sway bars, bushings, etc. each and retract the RF (Right Front) and LR 1 1/4 turns each. Brake pads badly taper worn - replace. My car has solid/spherical bushings everywhere, so there should be very little bind from them. Take the total weight of the car in the configuration you decide on, with driver or without, and to find the corners, do the following: TVW = Total Vehicle Weight = 2,800, LSP = left side. RC Oval racing is probably the easiest form of RC racing right, right? I had to do this with my truck. Are they adjustable? By lengthening or shortening a leg, it increases or decreases weight on the other legs. Andy Hollis does this. Here is the method to correct the corner weights and set the left rear bite or cross weight. You can see the article here: Your ride heights determine your arm angles up front, as well as the cambers, and, to a lesser degree-excuse the pun-the caster angles. It's Grassroots Motorsports Understanding Corner Weights It's just turning left 2 times per lap. But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. When Wedge is balanced at You're better off not corner balancing the car than doing it on an unlevel Make sure the floor is perfectly level; use shims under the scale pads if needed. Do this by making equal changes to the adjusters on each side. Corner Weight Calculator This is used to calculate the corner weight and Wedge. shocks set to same length left to right (front to rear will be different). Many electronic scales will perform the calculations for you. Even if you pay someone a small amount of money for their help, it will be far better than buying the scales yourself. Wedge Delta and what values work best for certain tracks and conditions Iretighten them after I've made all my adjustments. I difference that made. difficult to position all 4 scales so you can just drive up on all of them at Once you have returned the wheel corresponding to the spring change back to its measurement, the other wheel measurements will be OK. 3. Take your shock, compute the spring preload, and compress the shock/spring combo to the installed spring height in your spring rate fixture. 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. The overall effect is much like having no shock in the equation. You can So, they don't care if the scales are level, they will get what they want from unlevel scales. However, most importantly you need to take care of the handling. Typically, a road racing car should have 50% All 4 scales must be within 1/8 of an inch. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4 about 1/8" of wheel movement) to reduce the weight on the right front and left If you do have adjustable end For ovals we want a The ultimate goal is to find the balance that will eventually lead to faster lap times. An analogy which is commonly used is to imagine that the car is a four-legged table. 13. the same time. Don't be in a hurry to set ride This spreadsheet will also give you an estimated center of gravity height if then leave them connected. You can change ride heights later on, but remember that your front moment center geometry will change and your rear geometry will also change, including link angles and pinion and third link angles, as well as rear alignment in some cases. That is because all of the points move together. R. racing junky Member. Right Rear weight: < Enter your corner weights in pounds or kilos and click 'Calculate'. Right Rear. intentionally favor a turn direction. Jun 7, 2018 #5 . Just make sure none of them are flat or wildly overinflated. Once you have installed your coil-over suspension, mount the rims with the tires you will be racing with, and complete all other items that could impact the vehicles weight and placement of that weight. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. If we remember, or record this number, then we can easily make changes in the future to get to our intended crossweight percent fast and easy. 1 Establish the corner weights you think you need for your car. June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . pounds of preload to the scale weights. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. Dirt adds weight, binds suspension parts and hides potential problems > The bearings come well oiled and attract a lot of dirt. center of gravity (CG) height by using this page: My starting cross weight was 50.6%, I was off 7lbs The front is usually the lowest point on the car and most sanctions maintain a minimum ride height rule. If you want to raise the rear of the car then extend the RR I highly recommend using a laser level to confirm the 4 scales are level to one A. Caster and Caster split can be adjusted to find more speed and stability. Weight can be moved around at the track to fine tune the handling characteristics of the chassis. the driver seat and reconnect them so there's no preload on them. The situation isfrustrating. over). In the above example, to go from 52 percent to 50 percent cross-weight, try lowering the right front and the left rear one-half turn on the weight jack bolt or spring perch while raising the left front and right rear the same amount. Once you get the car up on the scales you'll We should now be at, or near, the desired crossweight percent. If the person reduces the force with which he's pressing against the ceiling, the weight read by the scales will decrease. Yeah generally its the same stagger 9/10 times. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. by about 1/4 inch so most of my adjustments were positive--they raised the car. You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and racers add "wedge" by adjusting the right rear spring perch--they right swapped). To favor right turns, put more weight on the racers only turn left we can balance the car for better grip in left Always record the cross-weights and ride heights for reference at the race track in case changes are needed. Ah, OK, thanks for the clarification. The spreadsheet's second page has a good article that goes into more detail of 12. few inches several times on the scales before each reading though just for good Moving weight to the front of the kart will provide more front-end grip. Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. that turns equally well in both directions. Record these. Left Rear tire is carrying more weight so it will get more traction and The other two corners will lose weight. In our example we will be using the same method with corrections for different rate springs. Once you get the car up on the scales you'll scales. That is equal to 7/8 turn of the adjuster. 12. 14. As for setting the left side and right side equal, I understandthe reason why it might be best, but hard for me to picture how to adjust it. 3.If you plan on having to set ride height without the driver, measure the difference with and without the driver in the car at all four corners and record those differences. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Get the numbers right and the percentages will follow. (Right Front + Left Rear) / (Left Front + Right Rear), When balanced the Cross Weight % will = 50%. 19. Wedge Most chassis manufacturers will tell you what ride heights are best for their cars. You should also complete this process with approximately the amount of gas with which you will be racing. Motor: 550 or 540 motors only. Classic Truck. balance is complete put someone in the driver seat and reconnect the Less fuel equals faster speeds. Corner weighting your car is turns. Youre always going to have some friction, especially depending on the type of suspension used. LR coil overs 2 1/2 turns. This will pitch the vehicle's. Keep in mind the stiffer your springs the Maybe I'm over-thinking this, but I was amazed when I got my new scales, and let my car down on them for the first time. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. I made a 4-scale system for my off-road cars. If your car has coil over adjustable shocks you should consider suspension changes to track your progress. It's the effective distribution that changes when you have suspension bind. We also change the rear to correct the side-to-side rake by turning the RR adjuster up (to lower the corner) by 2.5 turns and the LR adjuster down (to raise that corner) by 2.5 turns. turn to the RF simply to raise the ride height of the front of the car. It is best to make small changes at each corner, instead of a big change at one corner. 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Maybe there's some sort of bind in the scales. Jacking weight will not alter the left side or the rear percentages. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. turns to the Right Rear: I still needed more weight on the LF and RR so I added +4 to the LF: I still needed more so I added +2 to the RR and drove the Bite = Left Rear - Right Rear and a positive value means the I can see binding throwing off each corners weight but the sum should be the same. If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. The tiles I I needed 3 linoleum tiles (0.045" thick A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. Thinking about this a little, the weight measured by the scales is the sum of the force of gravity acting on the car's mass, and the force of the springs pressing downward. another. To calculate cross-weight percentage, add the RF weight to the LR weight and divide the sum by the total weight of the car. Mudboss Setup #3 - Traxxas Slash transmission setup and diff oil for oval racing Oval RC 216K subscribers Subscribe 812 Share 51K views 2 years ago #diff #setup #mudboss Traxxas Slash. Leebo's Corner. Since the front and rear shocks are of different lengths you 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. A. track are left turns then having more weight on the Right Front and Left Rear Guess I have to try it. The other two corners will gain weight. lowered onto the scales the tires will need to spread out to unbind the (corner weights) instead of moving shims above / below spindle? 7. The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. These weights are in ready to race form (including driver on board). The proper progression for these two parameters is to establish ride height first and then set the corner weights, which comes down to setting the crossweight. Toe inn a 1/4 inch. 5 diameter stainless ball bearing on top of a 1" shortwell socket on the center of a floor Jack and jack the car up in the center of the rearend housing. Wheel Offset Changes. I use 2x6 wood planks as ramps to drive the car onto the front ramps then jack up the rear and lower it onto the rear scales. Corner-Weight Distribution Bickel points out that corner-weight distribution refers to the amount of weight carried by diagonally opposed pairs of wheels. Remember that changes in stagger, tire pressures and springs will change the ride height and alter the cross-weight percentage. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. "Many racers are running stacked springs (pictured), or dual-rate springs, or soft, long-travel . Then move components like the battery or fuel cell. Doing the multiplication to square that number, we get 1.1056. the sway bars because they fail so often and the bars only added a couple of I borrowed some scales to weigh my Terceltomorrow. Picture the following: Your car is really fast in right-hand turns, but understeers in left turns. And don't ever believe the track scales. So we turn the RF adjuster up (to lower that corner) 2.5 turns and the LF down (to raise that corner) 2.5 turns. 6 Check your ride heights and make small adjustments for ride height and crossweight percentage if need be to finalize your setup. I didn't hunt for that missing 1 %. The left side changes, of course, will be 4.75 times the multiplier for front or rear. If the driver lifts early but still has a fairly good amount of roll speed into the corner, there probably isn't much brake being used. In order to perform the set up routine the car needs to be completely ready to race. It's critical that you set ride height in the same place each and every time you do it. All of these measurements are widened by the Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. On the other hand, it drives really, REALLY good for being setup by this idiot behind the keyboard, and I really don't wanna spoil a good setup by chasing after a perfect setup at least not yet. Do not copy these ride heights; they are only used as an example. Go in hard, let off and let the drag brake pivot the car, and get right back on the throttle. Make sure the tires are centered on the scales. This adds pressure to that end of the car just like putting the paper wedge underneath the table leg. be appropriate such as making small adjustments to all 4 wheels--add preload to On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. You can also estimate your car's Changing the ride height at any corner will change the cross-weight percentage. And what do you mean by "lots of bearings"? 50% then Wedge Delta will be 0. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . Thanks for posting this. This measurement can be manipulated by changing spring rates, coilover . These are your target weights which will yield a 50% Cross Weight: Left Front = I usually mark an even inch and write that inch number on the tape. When a NASCAR crewchief says he's "adding wedge", right swapped). Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. That math gives us a percentage number to . , = change needed to get to target weight, Cross Weight = I dropped my integra off at edge to have this done today. Since each side at each end will usually have different rate springs, the amount we change the spring height adjusters will differ side to side. The third, and probably the best, option seems to be to invest in a set of hub stands, as this not only takes care of the bind issues via their built-in rollers, but it just makes the task of doing the alignment a lot simpler as well. If most of the important turns on your You've mentioned "dead struts" a couple of times - what do you mean by that? If a setup sheet read as "30 pounds of bite", there would be 30 pounds more weight on the left-rear than the right-rear. Race Tires: Are You Ready to Spend Some Money? Crossweight is of no concern to the track officials. All 4 scales must be within 1/8 of an inch. of its weight on the Left Front and Right Rear tires, and 50% on the Right Front Don't just blindly cross weight it thinking it's the "right" way. The tiles & salt seemed to help because the weight never Use those racing internet forums, and dont be timid about asking for some assistance! 9. This approach is commonly used in oval track racing. Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. Interested in hearing peoples' opinions and (preferably) experiences. them for the corner balance. Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. If you think about this process and become familiar with the intent of it, then your process for setting ride heights and weight distribution should become easier and faster to do, not to mention less frustrating. A good starting point would be tank of gas. Now that we understand the value in maintaining ride heights, just what heights do we want? Can do to just left sidesor right sides, or to all 4. Basically - after you finish the set up routine, the car goes in the hauler. dry)! My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. Remember that there are several ways you can maintain ride heights at the track, with loaded spring length measurements, chassis to lower control arm or chassis to rear axle tube measurement are some of those. At the right rear, a quarter-inch change in the height of the end of the link will change the angle and can make an asphalt car undriveable. balancing see my corner balance how-to and not to push it off the scales, to unbind the suspension (as the car is Heres a. setup for a weekly show: 1. Or use an automotive tuning shop. spread when the car is lowered onto the scales. Oval To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Shock Position looking forward to getting it back! Road racers can take a page out of the oval racing book and Adjusting the sway bar is time consuming and questionable unless it is really stiff. bite, a negative value means the Right Rear is favored. On the one hand, I'd love to have my Supra corner weighted, just to see where it's at, see if there's room for improvement. One of the problems with cross-weight is that it will change the handling balance from a left to a right turn. should have their spring perches in the same spot and your left rear and right 1. Wedge is a term used in the Most oval track speedways are similar to those in the US for car racing such as sprint cars, speedcars (midgets) and sedans, with most tracks generally around mile (402 m) to mile (536 m) in length. Rear weight percentage for road racing and autocrossing is less definite. anti-roll bars then leave them connected. Reduced stopping power with normal brake pedal: Pad fade - due either to unbedded new pads or to temperature beyond. No, not as in the law, but in being legal in tech. I added the In our example it is 18 degrees. Check your tire pressure and bump it up to the hot pressure If you want to lower the rear of the car then retract the LR A place where you can add in your Photo Galleries. Right Front = In contrast, the corners on most ovals are super speedways are of a similar radius, and run within a very narrow range - closer to three-to-five miles an hour in difference. it would help the car turn left and accelerate better. , Left Rear = which is simply the difference between the two diagonal tire weights. If you are using scales as a base, level the scales with a long level, a long straight piece of tubing, square or round with a smaller level, or better yet, an instrument level such as a construction level. 8 Read the ride heights as they exist. In oval racing you always run more weight on the LR. There is a reason for this order. To find LF weight: Lowering the cross weight does the opposite of raising the cross weight. Teams that do not stay on top of these two setup phases will not only be inconsistent, they will struggle to find their way setup wise. you run on the track. This was my first adjustment: Four turns of positive coil % Wedge Delta will be 0 at 50% Wedge. Kart racing chassis are designed in a manner to allow it to turn the only way it can, without having a read differential - with the inside rear tire lifting off the track on corner entry. Wheel Load-We have already determined the wheel load we desire in No. Softer tire compound Right Rear Increase Right front and left rear Corner Weights Bicycling Left side tires lose contact with the racing surface More overall left side weight % and without me in the driver seat and yup, the theory is right--the cross weight 2 1/2 turns. On an average dirt track you will need to change tread and stagger at least once a night, due to changing conditions. Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. to measure your new springs and put the longest spring in the left front--this For pure race cars this isnt a consideration. Choose the cold temperatures because when the tires get hot, they will expand and your ride heights will be providing more adequate heights to pass tech after the race. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. Yep, old struts that are drained of fluid and have little to no resistance. Any press releases or advertising will be deleted. Astrut with its innards removed? the same time. We used to run about 1/8 of toe-in at the local tracks, and this helps the kart to cut through a corner easier in the center, where the steering is the greatest. rear. height and the shocks set to the exact same spring perch height I've had my cars corner balanced a lot, but never really looked into the science of it. Step 1 - Determine Sprung Weight. To keep things clear I call this added weight Wedge Delta To find RF weight: We use our multiplier to move each adjuster so that the preload changes are equal and the ride height will remain close to the same. front left and It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. You could also raise the left front or right rear ride heights to do the same thing. If it slows to 100rpm, the outside wheel will spin at 300rpm. Changing the amount of weight on each corner will change how the kart handles in a turn.

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